Our now 6 month old Bernese Mountain Dog is sensitive to chicken and I feel your pain. So many foods contain chicken in some form or another, even if it’s not shown as the first ingredient, so I feel your pain. Our breeder (and our vet confirmed and explained) started our pup off immediately on adult food rather than puppy food because puppy foods contain ingredients that promote faster growth (which is unwanted in a large breed dog). We didn’t find a large Breed food brand that didn’t contain chicken.
After many missteps, we’ve settled on Acana Lamb and Apple. It’s a limited ingredient food and our Billie is doing very well on it. There are (I think) four different protein sources to choose from. We don’t feed raw or canned so I can’t offer a suggestion there.
Good luck, I know it’s frustrating.
